L4976 データシートの表示（PDF） - STMicroelectronics
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L4976 Datasheet PDF : 17 Pages
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Pin settings
2
Pin settings
2.1
Pin connection
Figure 3. Pin connection (top view)
GND
1
VREF
2
OSC
3
OUT
4
8
FB
7
COMP
6
BOOT
5
VCC
N.C.
GND
VREF
OSC
OUT
OUT
N.C.
N.C.
DIP8
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
SO16
L4976
N.C.
N.C.
FB
COMP
BOOT
VCC
N.C.
N.C.
2.2
Pin description
Table 1. Pin description
N° Pin
DIP8
SO16W (1)
Name
Description
1
2
GND Ground
2
3
VREF 5.1V Reference voltage with 20mA current capability.
An external resistor connected between the unregulated
3
4
OSC
input voltage and this pin and a capacitor connected
from this pin to ground fix the switching frequency. (Line
feed forward is automatically obtained)
4
5, 6
OUT Stepdown regulator output.
5
11
VCC Unregulated DC input voltage.
6
12
BOOT
A capacitor connected between this pin and OUT allows
to drive the internal VDMOS.
7
13
COMP E/A output to be used for frequency compensation.
Stepdown feedback input. Connecting directly to this pin
8
14
FB
results in an output voltage of 3.3V. An external resistive
divider is required for higher output voltages.
1. Pins 1, 7, 8, 9, 10, 15 and 16 are not internally, electrically connected to the die.
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